Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 6 28.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/30/2021   10:13:02   (  -0.01,-128.28) (   0.18,-129.01)   83.92                80
 07/01/2021   09:56:44   (   0.00,-128.26) (  -0.87,-124.43)  437.11                80
 07/02/2021   22:15:40   (   0.02,-128.14) (  -0.32,-129.64)  170.02                80
 07/03/2021   21:59:22   (   0.01,-128.12) (   0.67,-125.04)  351.00                80
 07/05/2021   10:18:10   (  -0.03,-128.17) (   0.41,-130.23)  233.78                80
 07/06/2021   10:01:52   (  -0.02,-128.15) (  -0.58,-125.63)  286.58                80
 07/07/2021   22:20:48   (   0.04,-128.01) (  -0.59,-130.84)  322.21                80
 07/08/2021   22:04:30   (   0.03,-127.99) (   0.40,-126.24)  197.98                80
 07/10/2021   10:23:18   (  -0.05,-128.03) (   0.69,-131.43)  387.69                80
 07/11/2021   10:06:59   (  -0.04,-127.99) (  -0.30,-126.83)  132.00                80